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/*
* Aethyra
* Copyright (C) 2004 The Mana World Development Team
*
* This file is part of Aethyra based on original code
* from The Mana World.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ambientoverlay.h"
#include "image.h"
#include "../graphics.h"
AmbientOverlay::AmbientOverlay(Image *img, float parallax,
float speedX, float speedY):
mImage(img), mParallax(parallax),
mPosX(0), mPosY(0),
mSpeedX(speedX), mSpeedY(speedY)
{
mImage->incRef();
}
AmbientOverlay::~AmbientOverlay()
{
mImage->decRef();
}
void AmbientOverlay::update(int timePassed, float dx, float dy)
{
// Self scrolling of the overlay
mPosX -= mSpeedX * timePassed / 10;
mPosY -= mSpeedY * timePassed / 10;
// Parallax scrolling
mPosX += dx * mParallax;
mPosY += dy * mParallax;
int imgW = mImage->getWidth();
int imgH = mImage->getHeight();
// Wrap values
while (mPosX > imgW)
mPosX -= imgW;
while (mPosX < 0)
mPosX += imgW;
while (mPosY > imgH)
mPosY -= imgH;
while (mPosY < 0)
mPosY += imgH;
}
void AmbientOverlay::draw(Graphics *graphics, int x, int y)
{
graphics->drawImagePattern(mImage,
(int) -mPosX, (int) -mPosY, x + (int) mPosX, y + (int) mPosY);
}
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